curl --location --request POST 'http://localhost:18321/v1/message/send' \
--form 'token=""' \
--form 'mail_id="mail_demo_001"' \
--form 'to="[email protected]"' \
--form 'cc="[email protected]"' \
--form 'bcc=""' \
--form 'subject="Sample message from local API"' \
--form 'html_body="<p>Hello, this is a sample HTML message.</p>"' \
--form 'plain_text_body="Hello, this is a sample plain text message."' \
--form 'in_reply_to="<[email protected]>"' \
--form 'references="[\"<[email protected]>\"]"' \
--form 'priority="3"' \
--form 'request_read_receipt="-1"' \
--form 'attachments="[{\"file_name\":\"demo.txt\",\"content_type\":\"text/plain\",\"content_base64\":\"SGVsbG8=\"}]"'